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# How to calculate MAV weight?

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### #1 kellyvang92

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Posted 13 September 2022 - 01:36 PM

Please help! We package 8 oz. cheese how do i calculate the minimum MAV for the product. Also how do i get the maximum MAV

### #2 Scampi

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Posted 13 September 2022 - 01:43 PM

Here you are

https://www.fsis.usd..._Net_Weight.pdf

10% i think is your MAV for this item

so +/- 0.8 ounces per package

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### #3 kellyvang92

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Posted 13 September 2022 - 01:49 PM

I still don't understand how to calculate the Lower limit of the MAV

### #4 Scampi

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Posted 13 September 2022 - 02:03 PM

PLUS or MINUS 10%

8 ounces - .08 = 7.92 ounces as your bottom weight allowed

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### #5 kellyvang92

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Posted 13 September 2022 - 02:06 PM

Scampi... how did you get the 7.92? this is what i dont understand

### #6 Scampi

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Posted 13 September 2022 - 03:32 PM

Whoops  i missed a decimal place

if 8 ounces is your declared weight, 10% of that is 0.8 ounces

Subtract the 0.8 ounces to get 7.2 ounces  (sorry I'm a metric person)

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### #7 nwilson

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Posted 13 September 2022 - 04:02 PM

Us the link below, it is a lengthy document and has tables at the end to help guide you to the appropriate Maximum Allowable Variance for a specified weight.

https://nvlpubs.nist...HB.133-2020.pdf

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### #8 CStormG

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Posted 10 May 2023 - 04:12 PM

MAV is calculated using the NIST Handbook 133.  MAV for an 8oz product being labeled by weight is 7/16oz or 0.4375oz.  So, your minimum is 7.5625oz and your maximum is 8.4375oz.

It is not simply 10%, you will have issues if anyone inspects your finished product once they investigate your methods of weight control.  The 10% rule applies to fill volume to the chagrin of potato chip manufacturers.

I'm going to try to attach the handbook, check Table 2-5 (pg 79).

*edit:  I attached the older 2011 handbook (previous commenter attached the current anyway), but it's still the same table and values.

Edited by CStormG, 10 May 2023 - 04:16 PM.

### #9 Charles.C

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Posted 10 May 2023 - 04:57 PM

MAV is calculated using the NIST Handbook 133.  MAV for an 8oz product being labeled by weight is 7/16oz or 0.4375oz.  So, your minimum is 7.5625oz and your maximum is 8.4375oz.

It is not simply 10%, you will have issues if anyone inspects your finished product once they investigate your methods of weight control.  The 10% rule applies to fill volume to the chagrin of potato chip manufacturers.

I'm going to try to attach the handbook, check Table 2-5 (pg 79).

*edit:  I attached the older 2011 handbook (previous commenter attached the current anyway), but it's still the same table and values.

Sorry, no attachment achieved. You need to click on the "More reply options" box at bottom right hand side and follow the instructions on new page.

Kind Regards,

Charles.C

### #10 Ryan M.

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Posted 10 May 2023 - 05:23 PM

Here's the current NIST 133 handbook.

https://www.nist.gov...current-edition

Your MAV calculation will be dependent on the product type, and the unit package size.  Also, if you sell as a multiunit pack, you may have to consider the MAV for the entire multiunit pack.

### #11 sssolorzanooo

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Posted 09 September 2023 - 09:05 PM

It is important to note that MAV differs depending on what type of product it is. Someone referenced the USDA FSIS MAV Net Weight, but that is for Meat and Poultry products, and MAV for meat and poultry differs in that if the MAV was 10% of 8oz steak then the MAX=+-.8oz. However if the inspector does a Net Weigh check and he finds a 7.2oz steak, this doesn't necessarily mean that the lot passed. USDA uses 2 criteria that need to be met and are as follows:

Decision criteria: The rules for determining whether the inspection lot complies with the net weight requirements. The net weight test results must meet BOTH criteria.

1) The total package error (sum of the individual package errors) is equal to or greater than zero.

2) No individual minus package error can exceed the MAV.

https://www.fsis.usd..._Net_Weight.pdf

See Page 7.

EXAMPLES:

1) If after checking 20 steaks the total difference is negative then the lot fails (for example 20 steaks of 8oz should be 160oz total, so if inspector checks and its 158oz total, according to the criteria the lot will not pass either). The +-.8oz is just a wiggle room just in case some steaks are short weighted, however the other steaks need to be heavier than 8oz to level the difference.

2) If inspector checks 20 steaks, and 1 steak is under 7.2oz, the entire lot fails automatically.

Edited by sssolorzanooo, 09 September 2023 - 09:06 PM.

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